list_authors()

Is there a way to get list_authors (or another WordPress API to put user-defined text/code before and after each list item it generates? I would like to generate a page that lists out the authors and puts a picture and some info about each of them. I would rather not use a hack to do this, if I don’t have to. Currently, I’m using this code to generate the list of authors, but I’m at a loss for where to go next.

Hello Dr. Who. Thanks for the pointer! It was very helpful. I decided to change how I’m going about this a little bit. As you can see in the code below, I’m now using PHP to pull the author pic, if it exists. However, for some reason file_exists() keeps returning FALSE when I know for a fact the file is there. Any thoughts?